A4 Stainless Steel Single-End Studs are supplied to Trade series (single-end studs). The grade provides superior, including marine and chloride environments and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint. Property data, grade comparison and the full size table follow.
Why Choose A4 Stainless Steel for Single-End Studs
Specified for marine, coastal and chemical applications. For single-end studs, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Single-End Studs in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless single-end studs: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Using Stainless Fasteners in Aluminum
The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.
Sizes of Single-End Studs Available in A4 Stainless Steel
| Thread size | Overall length (in) | Thread length (in) | Shaft length (in) | Material | Unthreaded end use |
|---|---|---|---|---|---|
| 6-32 | 1 | 1/2 | 1/2 | 304 stainless steel | pivot / hinge / shaft / locator |
| 6-32 | 1-1/2 | 3/4 | 3/4 | 304 stainless steel | pivot / hinge / shaft / locator |
| 6-32 | 2 | 3/4 | 1-1/4 | 304 stainless steel | pivot / hinge / shaft / locator |
| 6-32 | 2-1/2 | 3/4 | 1-3/4 | 304 stainless steel | pivot / hinge / shaft / locator |
| 6-32 | 3 | 3/4 | 2-1/4 | 304 stainless steel | pivot / hinge / shaft / locator |
| 8-32 | 1~3 | same pattern as 6-32 | same pattern as 6-32 | 304 stainless steel | pivot / hinge / shaft / locator |
| 10-24 | 1 / 1-1/2 | 304 stainless steel | pivot / hinge / shaft / locator |
